JPWO2011055449A1 - Vehicle power generation voltage control device - Google Patents

Abstract

Even if the monitoring detection circuit fails, a vehicular power generation voltage control device having improved reliability at the time of failure in controlling the excitation current flowing in the field winding is obtained. An output voltage of the vehicle generator or a battery terminal voltage connected to the vehicle generator is detected by a plurality of monitoring detection circuits, respectively, and field windings of the vehicle generator are detected by outputs of the plurality of monitoring detection circuits. The excitation current flowing in the vehicle is intermittently controlled to control the output voltage of the vehicle generator or the battery terminal voltage connected to the vehicle generator to a target voltage.

Description

  The present invention relates to a vehicular generated voltage control apparatus for controlling a generated voltage of a vehicular generator mounted on a passenger car, a truck, or the like.

  In the vehicular power generation voltage control device, the switching element connected in series with the field winding of the vehicular generator is connected to the output voltage of the vehicular generator or the vehicular generator. Some have a voltage control device that controls the terminal voltage of the battery to a target voltage. There is generally one input voltage monitoring / detection circuit included in the voltage control device for one detection target (control target). There may be one for a plurality of detection targets.

  Conventionally, when the monitoring detection circuit fails, for example, when the smoothing capacitor leaks, the voltage comparison circuit always fails, or the in-circuit disconnection failure, does the control voltage increase or decrease from the original expected value? As a result, the vehicle voltage (the output voltage of the vehicle generator, etc.) is seriously hindered. Conventionally, the failure of a voltage control device has mainly been a short circuit or an open circuit of an exciting current control switching element, and various devices also employ an alarm function and a safety function in preparation for these situations.

JP 2009-189140 A

On the other hand, based on the recent downsizing of the semiconductor chip responsible for controlling the voltage control device, the downsizing of the smoothing capacitor in the semiconductor chip, and the deterioration of the thermal environment of the vehicle, only the failure of the exciting current control switching element However, there is an urgent need to take safety measures against failure of the monitoring detection circuit.
The present invention has been made to solve the above-described problems, and is intended for a vehicle in which the reliability at the time of failure in controlling the excitation current flowing in the field winding is improved even if the monitoring detection circuit fails. The object is to obtain a generated voltage control device.

  The vehicle power generation voltage control device according to the present invention intermittently applies an excitation current flowing in a field winding of a vehicle generator, and outputs an output voltage of the vehicle generator or a battery terminal voltage connected to the vehicle generator. In the vehicular power generation voltage control apparatus that controls to a target voltage, the output voltage of the vehicular generator or the battery terminal voltage connected to the vehicular generator is detected by a plurality of monitoring detection circuits, respectively, and a plurality of the monitoring detections are detected. The excitation current flowing in the field winding of the vehicle generator is intermittently controlled by the output of the circuit, and the output voltage of the vehicle generator or the battery terminal voltage connected to the vehicle generator is controlled to the target voltage. It is what I did.

  The vehicle power generation voltage control device according to the present invention is a battery terminal connected to the output voltage of the vehicular generator or the vehicular generator by intermittently exciting current flowing in a field winding of the vehicular generator. In the vehicular power generation voltage control device that controls the voltage to the target voltage, the reference voltage is compared with the input voltage detected by inputting the output voltage of the vehicular generator or the battery terminal voltage connected to the vehicular generator. A plurality of monitor detection circuits that generate an output when the input voltage is lower than a reference voltage, and an output when the input voltage is lower than the reference voltage is generated from all of the plurality of monitor detection circuits. A control processing unit that generates an output according to conditions, and an output current of the vehicle generator or the vehicle generator by causing an exciting current to flow through the field winding of the vehicle generator by the output of the control processing unit. Close to Battery terminal voltage is obtained so as to control the target voltage.

  According to the vehicular power generation voltage control apparatus according to the present invention, the output voltage of the vehicular generator or the battery terminal voltage connected to the vehicular generator is detected by the plurality of monitoring detection circuits. It is possible to improve the reliability at the time of failure to control the excitation current flowing in the line.

In addition, according to the vehicular power generation voltage control apparatus according to the present invention, the input voltage detected by inputting the output voltage of the vehicular generator or the battery terminal voltage connected to the vehicular generator is compared with the reference voltage. The multiple monitor detection circuits that generate an output when the input voltage is lower than the reference voltage, and the output when the input voltage is lower than the reference voltage are generated from all of the multiple monitor detection circuits It has a control processing unit that generates output, so that it can improve the reliability at the time of failure for the control of the excitation current flowing in the field winding and also improve the reliability by preventing overcharge at the time of failure Can be made.
Other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention with reference to the drawings.

1 is a configuration diagram showing a vehicular power generation voltage control apparatus according to Embodiment 1 of the present invention; FIG. FIG. 3 is a diagram illustrating a configuration of a main part of the voltage control device according to the first embodiment. It is a figure which shows the output state and control result of each part at the time of soundness and failure in Embodiment 1. It is a figure which shows the structure which implement | achieved one part with the software in the principal part of the voltage control apparatus in Embodiment 2.

Embodiment 1 FIG.
1 is a block diagram showing a vehicular generated voltage control apparatus according to Embodiment 1 of the present invention. A vehicle generator 1 includes a three-phase stator winding 2 included in a stator, a field winding 3 included in a rotor, and a rectifier circuit for full-wave rectification of the three-phase output of the stator winding 2. 4. The output voltage of the output terminal 5 of the vehicle generator 1 (or the terminal voltage of the battery 6 connected to the generator) is controlled by intermittently controlling the excitation current for the field winding 3 by the voltage control device 7. Done. The output terminal 5 is connected to a battery 6 and various electric loads 8 via a charging line. The ground terminal 9 is connected to the frame of the vehicle generator 1. The terminal 10 is connected to an ECU 5 as an external control device.

  The semiconductor switching element 12 is connected in series to the field winding 3, and an exciting current flows through the field winding 3 in the on state. The freewheeling diode 13 is connected in parallel to the field winding 3 and recirculates the exciting current when the switching element 12 is in the off state. The first input voltage detection circuit 21 and the first comparison circuit 22 are paired to monitor and detect the generator output voltage or the battery terminal voltage at the output terminal 5. Similarly, the second input voltage detection circuit 23 and the second comparison circuit 24 are paired to monitor and detect the generator output voltage or the battery terminal voltage at the output terminal 5. That is, each pair (in other words, a plurality of monitoring detection circuits) detects the same detection target. Then, the output of each pair is input to the control processing unit 25. The control processing unit 25 performs on / off control of the switching element 12 so that the generator output voltage or the battery terminal voltage at the output terminal 5 becomes the target voltage by the output of each pair.

  The rotation signal detector 26 detects the rotation speed of the vehicle generator 1 by monitoring the phase voltage appearing in any phase of the stator winding 2, and outputs a voltage corresponding to the detected rotation speed. Input to the control processing unit 25. Thereby, control according to the rotation speed can be performed. For example, when the engine is stopped, the upper limit of the duty of the switching element 12 is limited to 20%. The communication signal control unit 27 performs bidirectional serial communication with the ECU 11 via the terminal 10, receives and decodes a communication frame periodically sent from the ECU 11, and inputs the communication frame to the control processing unit 25. The communication frame transmitted from the ECU 11 includes an adjustment voltage (reference voltage) for controlling the output voltage of the vehicle generator 1 to be constant.

  If the reference voltage is 14V, the adjustment voltage is adjusted to, for example, 10V when the vehicle is accelerated and 16V when the vehicle is decelerated. In addition, the communication signal control unit 27 transmits a communication frame to the ECU 11 via the terminal 10. The communication frame transmitted to the ECU 11 includes data indicating the result of diagnosing the presence or absence of abnormality such as the generator output voltage and failure information. The control processing unit 25 performs power generation control for maintaining the output voltage or battery terminal voltage of the vehicle generator 1 constant. The contents and control parameters of the power generation control are set based on the power generation control information included in the communication frame sent from the ECU 11.

  FIG. 2 is a configuration diagram mainly showing two pairs of “input voltage detection circuit” and “comparison circuit” and “control processing unit” in the first embodiment. In each figure, the same code | symbol shows the same or an equivalent part. The generator output voltage or battery terminal voltage at the output terminal 5 is input to the first input voltage detection circuit 21 and the second input voltage detection circuit 23, respectively. In the first input voltage detection circuit 21, R11 and R12 are resistors, and divide the input voltage. The resistor R13 and the capacitor C1 are CR filters, which are formed of a semiconductor chip. When obtaining a constant value CR filter, the capacitance C is usually small and the resistance value R is large in order to reduce the area. The voltage of the capacitor C1 is amplified by the operational amplifier OP1. The operational amplifier OP1 is connected to a power source Vcc having a constant voltage and a constant current. The second input voltage detection circuit 23 is similarly configured, and includes a resistor R21, a resistor R22, a resistor R23, a capacitor C1, and an operational amplifier OP2.

  The output voltage of the operational amplifier OP1 is input to the first comparison circuit 22. The comparator CMP1 connected to the constant voltage and constant current power source Vcc receives the output voltage of the operational amplifier OP1 at its inverting input terminal and the reference voltage (for example, 14V) as the noninverting terminal. A voltage serving as a reference voltage is supplied from the control processing unit 25. The comparator CMP1 outputs a logical value 0 (low level) when the output voltage of the operational amplifier OP1 is larger than the reference voltage (that is, the input voltage input to and detected by the first input voltage detection circuit 21). When the output voltage of the operational amplifier OP1 is smaller than the reference voltage (that is, the input voltage input to and detected by the first input voltage detection circuit 21), a logical value 1 (high level ON output) is output. Similarly, the output voltage of the operational amplifier OP <b> 2 is input to the second comparison circuit 24. The output voltage of the operational amplifier OP2 is also input to the comparator CMP2 of the second comparison circuit 24, and the reference voltage is input to the non-inverting terminal. A voltage serving as a reference voltage is supplied from the control processing unit 25. The comparator CMP2 outputs a logical value 0 (low level) when the output voltage of the operational amplifier OP2 is larger than the reference voltage, and a logical value 1 (high level) when the output voltage of the operational amplifier OP2 is smaller than the reference voltage. ON output) is output.

  The outputs of the comparators CMP1 and CMP2 are input to the control processing unit 25 and input to the AND circuit 28 and the OR circuit 29, respectively. When the outputs of the comparators CMP1 and CMP2 are both high level (on output) (that is, when the input voltage due to the generator output voltage is smaller than the reference voltage), the outputs of the AND circuit 28 and OR circuit 29 are both high level. Become. Therefore, if the changeover switch 30 is in the connected state as shown in the figure, the output (high level) of the AND circuit 28 is applied to the base of the switching element 12, the switching element 12 is turned on, and the field of the vehicle generator 1 is turned on. A current flows through the winding 3, a magnetic flux is generated in the field winding 3, and a current is induced in the stator winding 2 to generate a voltage. When the input voltage due to the voltage at the output terminal of the vehicle generator 1 eventually exceeds the reference voltage, the outputs of the comparators CMP1 and CMP2 both become low level (that is, the input voltage due to the generator output voltage becomes greater than the reference voltage). The switching element 12 is turned off by the output (low level) of the AND circuit 28, the current of the field winding 3 of the vehicle generator 1 is cut off, and the voltage of the stator winding 2 starts to decrease. Again, the input voltage due to the voltage at the output terminal of the vehicular generator 1 falls below the reference voltage, and the outputs of the comparators CMP1 and CMP2 both become high level. Thereafter, these are repeated, and the generator output voltage becomes the target voltage.

  Next, the control result of the voltage control apparatus when a disconnection failure or an excessive output failure occurs on either the second input voltage detection circuit 23 side, for example, will be described. When a disconnection failure occurs on the second input voltage detection circuit 23 side, the output voltage of the operational amplifier OP2 becomes 0. When an excessive output failure occurs on the second input voltage detection circuit 23 side, the output voltage of the operational amplifier OP2 is the reference voltage of the comparator CMP2. Assume that more output is generated. Note that the output voltage of the operational amplifier OP2 is 0 or close to 0 because of a short circuit, an increase in leakage current, a change in resistance value, etc. in addition to the disconnection. When the output voltage of the operational amplifier OP2 is larger than the reference voltage of the comparator CMP2 due to an excessive output failure, there are causes such as a short circuit, an increase in leakage current, and a resistance value change. FIG. 3 is a diagram showing an output state of each unit and a control result at the time of soundness and failure in the first embodiment. The input voltage means an input voltage detected when the output terminal 5 is input to the input voltage detection circuit 21 or 23. The healthy state means that no failure has occurred in the input voltage detection circuit 21 or 23.

(1) When input voltage> reference voltage
(A) When sound, the outputs of OMP1 and OMP2 are both 0, the AND circuit output is 0, the switching element is turned off via the changeover switch 30, and charging is not performed. If the connection state of the changeover switch 30 is on the OR circuit 29 side, the OR circuit output is 0, the switching element is turned off, and charging is not performed. In this case, both the AND circuit output side and the OR circuit output side are not charged.

  (B) When the circuit 23 is disconnected, the output of OMP1 is 0, the output of OMP2 is 1, the AND circuit output is 0, the switching element is turned off via the changeover switch 30, and charging is not performed. If the connection state of the changeover switch 30 is on the OR circuit 29 side, the OR circuit output is 1, the switching element is turned on, and overcharging is performed. In this case, since the AND circuit output side is not charged and the OR circuit output side is overcharged, the OR circuit output side cannot be adopted. In FIG. 3, since there is a problem in turning on the switching element on the OR circuit output side, the problem is indicated with an underline.

  (C) When the circuit 23 side is excessively output, the outputs of OMP1 and OMP2 are both 0, the AND circuit output is 0, the switching element is turned off via the changeover switch 30, and charging is not performed. If the connection state of the changeover switch 30 is on the OR circuit 29 side, the OR circuit output is 0, the switching element is turned off, and charging is not performed. In this case, both the AND circuit output side and the OR circuit output side are not charged.

(2) When input voltage <reference voltage,
(A) When healthy, the outputs of OMP1 and OMP2 are both 1, the AND circuit output is 1, the switching element is turned on via the changeover switch 30, and charging is performed. If the connection state of the changeover switch 30 is on the OR circuit 29 side, the OR circuit output is 1, the switching element is turned on, and charging is performed. In this case, both the AND circuit output side and the OR circuit output side are charged.

  (B) When the circuit 23 is disconnected, both the outputs of OMP1 and OMP2 are 1, the AND circuit output is 1, the switching element is turned on via the changeover switch 30, and charging is performed. If the connection state of the changeover switch 30 is on the OR circuit 29 side, the OR circuit output is 1, the switching element is turned on, and charging is performed. In this case, both the AND circuit output side and the OR circuit output side are charged.

  (C) When the circuit 23 has an excessive output, the output of OMP1 is 1, the output of OMP2 is 0, the AND circuit output is 0, the switching element is turned off via the changeover switch 30, and charging is not performed. If the connection state of the changeover switch 30 is on the OR circuit 29 side, the OR circuit output is 1, the switching element is turned on, and charging is performed. In this case, since the AND circuit output side is not charged and the OR circuit output side is charged, the AND circuit output side is not originally adopted. In FIG. 3, since there is a problem in turning off the switching element on the AND circuit output side, the problem is indicated by being underlined.

  In FIG. 3, the control result of the voltage control apparatus when the disconnection failure or the excessive output failure occurs in either one of the input voltage detection circuits has been described. Based on these control results, it is examined whether the selector switch 30 of the control processing unit 25 should be connected to the AND circuit 28 side or the OR circuit 29 side. The problem is (1) when input voltage> reference voltage, and when the circuit 23 side is disconnected, the switch element is turned on on the OR circuit side, and overcharge is performed. (2) When the input voltage is smaller than the reference voltage and the circuit 23 side is excessively output, the switch element is turned off on the AND circuit side and charging is not performed.

  Comparing these problems (1) and (2), the effect of failure is greater in the case of overcharge (1) than in the case of no charge (2). That is, if the battery connected to the generator is overcharged, it leads to a serious failure that damages the battery. Therefore, in the first embodiment, the changeover switch 30 of the control processing unit 25 is connected to the AND circuit 28 side. That is, the outputs of the plurality of monitoring detection circuits are connected to the AND circuit 28, and the outputs are generated on condition that the output when the input voltage becomes lower than the reference voltage is generated from all of the plurality of monitoring detection circuits. The control processing unit 25 was used. Thereby, even if a disconnection failure or an excessive output failure occurs in any of the plurality of monitoring detection circuits, overcharge can be prevented and reliability is improved. If the problem is more important in the case of no charge (2) than in the case of overcharge (1), the changeover switch 30 of the control processing unit 25 may be connected to the OR circuit 29 side. Conceivable.

  Next, the soundness inspection at the time of shipment of the voltage control apparatus of FIG. 2 will be described. In the soundness inspection, a switching signal from the communication signal control unit 27 is applied to the control processing unit 25 to switch the connection state of the changeover switch 30 from the solid line side to the dotted line side. That is, switching to the OR circuit 29 side is performed. Switching of the connection state of the changeover switch 30 is performed by applying a test mode signal of about 5000 Hz, for example, to the rotation signal detecting unit 26 and inputting it to the control processing unit 25. May be.

  Here, a voltage higher than the target voltage is applied to the output terminal 5. Then, the outputs of the comparators CMP 1 and CMP 2 to which the outputs of the operational amplifier OP 1 and the operational amplifier OP 2 are applied are both at a low level if the first and second input voltage detection circuits 21 and 13 are healthy, and the output of the OR circuit 29. Becomes low level, the low level is applied to the base of the switching element 12 via the changeover switch 30, and the switching element 12 is turned off. However, if one of the first and second input voltage detection circuits 21 and 13 is disconnected, one of the outputs of the comparators CMP1 and CMP2 is at a high level, and the output of the OR circuit 29 is at a high level. A high level is applied to the base of the switching element 12 via the switch 30, and the switching element 12 is turned on. Therefore, if one of the first and second input voltage detection circuits 21 and 13 is disconnected, it can be detected by the output of the OR circuit 29, that is, when the switching element 12 is turned on.

Embodiment 2.
FIG. 4 shows a main part of the voltage control apparatus according to the second embodiment, and shows a configuration in which one part is realized by software. In the second embodiment, three monitoring detection circuits are provided for one detection target. A different part from Embodiment 1 is mainly demonstrated. The resistors R11 and R12 divide the input voltage that is the voltage of the output terminal 5. The capacitor C1 holds the voltage at the connection point between the resistor R11 and the resistor R12. The first input voltage holding circuit 31 is configured by the resistors R11, R12, and the capacitor C1. Similarly, the resistors R21 and R22 divide the input voltage. The capacitor C2 holds the voltage at the connection point between the resistor R21 and the resistor R22. The resistor R21, resistor R22, and capacitor C2 constitute the second input voltage holding circuit 32. Resistor R31 and resistor R32 divide the input voltage. The capacitor C3 holds the voltage at the connection point between the resistor R31 and the resistor R32. The resistor R31, resistor R32, and capacitor C3 constitute a third input voltage holding circuit 33.

  The multiplexer 34 selectively extracts the voltages of the capacitors C1, C2, and C3 in order in a time division manner and inputs them to the A / D converter ADC. The A / D converter ADC converts the analog values of the voltages of the capacitors C1, C2, and C3 input in order into digital values. The voltages of the capacitors C1, C2, and C3 converted into digital values are sequentially distributed by the multiplexer 35 to the first input voltage storage register 36, the second input voltage storage register 37, and the third input voltage storage register 38. The multiplexer 34 and the multiplexer 35 are synchronized, and the voltages of the capacitors C1, C2, and C3 are sequentially distributed and stored in the first input voltage storage register 36, the second input voltage storage register 37, and the third input voltage storage register 38, This is repeated. By repeating, the digital values of the current voltages of the capacitors C1, C2, and C3 are input to the input voltage storage registers 36, 37, and 38 and updated.

  Therefore, the first input voltage storage register 36 stores and holds the digital value of the current voltage of the capacitor C1, and the second input voltage storage register 37 stores and holds the digital value of the current voltage of the capacitor C2. The storage register 38 stores and holds the current digital value of the voltage of the capacitor C3. The first input voltage holding circuit 31, the multiplexers 34 and 35, the A / D converter ADC, and the first input voltage storage register 36 constitute a first input voltage detection circuit. The second input voltage holding circuit 32, the multiplexers 34 and 35, the A / D converter ADC, and the second input voltage storage register 37 constitute a second input voltage detection circuit. The third input voltage holding circuit 33, the multiplexers 34 and 35, the A / D converter ADC, and the third input voltage storage register 38 constitute a third input voltage detection circuit.

  The first comparison circuit 39 compares the digital value of the input voltage stored in the third input voltage storage register 38 with the digital value of the reference voltage from the control processing unit 42, and the digital value of the input voltage is the reference voltage. When the digital value is larger, the low level output is input to the control processing unit 42, and when the input voltage digital value is smaller than the reference voltage digital value, the high level (ON output) output is input to the control processing unit 42. input. Similarly, the second comparison circuit 40 compares the digital value of the input voltage stored in the second input voltage storage register 37 with the digital value of the reference voltage from the control processing unit 42, and the digital value of the input voltage is When the digital value of the reference voltage is larger than the digital value of the reference voltage, the low level output is input to the control processing unit 42. When the digital value of the input voltage is smaller than the digital value of the reference voltage, the high level output is input to the control processing unit 42. To do. The third comparison circuit 41 compares the digital value of the input voltage stored in the first input voltage storage register 36 with the digital value of the reference voltage from the control processing unit 42, and the digital value of the input voltage is the reference voltage. When it is larger than the digital value, a low level output is input to the control processing unit 42, and when the digital value of the input voltage is smaller than the digital value of the reference voltage, a high level output is input to the control processing unit 42.

  In the control processing unit 42, when the logic outputs of the comparison circuits 39, 40, 41 are all at a high level, a high level logic output is generated, the switching element 12 is turned on, and the generator output voltage is restored to the reference voltage. be able to. Further, when any one of the logic outputs of the comparison circuits 39, 40, and 41 is at a low level, a logic output at a low level is generated to turn off the switching element 12 to prevent overcharge of the generator output voltage.

  In the above description, when all the logic outputs of the comparison circuits 39, 40, and 41 are at a high level, the switching element 12 is turned on and the generator output voltage is restored to the reference voltage. For a logical output, a majority decision is made to determine whether it is high level or low level, that is, in this case, when two or more logic outputs are high level, the switching element 12 is turned on and two or more logic outputs are turned on. When is at a low level, the switching element 12 may be turned off. If the logic outputs of the comparison circuits 39, 40, 41 are determined by majority decision, it is possible to normally control any one of the three monitoring / inspection circuits of the input voltage.

Also in the second embodiment, in the inspection of the soundness at the time of shipment, it is possible to inspect whether or not the same output is generated with respect to the logical outputs of the comparison circuits 39, 40, and 41.
Various modifications or alterations of the present invention can be realized by related skilled engineers without departing from the scope and spirit of the present invention, and are not limited to the embodiments described in this specification. Should be understood.

Embodiment 1 FIG.
1 is a block diagram showing a vehicular generated voltage control apparatus according to Embodiment 1 of the present invention. A vehicle generator 1 includes a three-phase stator winding 2 included in a stator, a field winding 3 included in a rotor, and a rectifier circuit for full-wave rectification of the three-phase output of the stator winding 2. 4. The output voltage of the output terminal 5 of the vehicle generator 1 (or the terminal voltage of the battery 6 connected to the generator) is controlled by intermittently controlling the excitation current for the field winding 3 by the voltage control device 7. Done. The output terminal 5 is connected to a battery 6 and various electric loads 8 via a charging line. The ground terminal 9 is connected to the frame of the vehicle generator 1. The terminal 10 is connected to an ECU 11 as an external control device.

The semiconductor switching element 12 is connected in series to the field winding 3, and an exciting current flows through the field winding 3 in the on state. The freewheeling diode 13 is connected in parallel to the field winding 3 and recirculates the exciting current when the switching element 12 is in the off state. A first input voltage detection circuit 21 first comparator circuit 22 is a pair, and the monitors the generator output voltage or the battery terminal voltage at the output terminal 5 detects. Similarly, the second input voltage detection circuit 23 and the second comparator circuit 24 is a pair, and the detecting and monitoring the generator output voltage or the battery terminal voltage at the output terminal 5. That is, each pair (in other words, a plurality of monitoring detection circuits) detects the same detection target. Then, the output of each pair is input to the control processing unit 25. The control processing unit 25 performs on / off control of the switching element 12 so that the generator output voltage or the battery terminal voltage at the output terminal 5 becomes the target voltage by the output of each pair.

FIG. 2 is a configuration diagram mainly showing two pairs of “input voltage detection circuit” and “comparison circuit” and “control processing unit” in the first embodiment. In each figure, the same code | symbol shows the same or an equivalent part. The generator output voltage or battery terminal voltage at the output terminal 5 is input to the first input voltage detection circuit 21 and the second input voltage detection circuit 23, respectively. In the first input voltage detection circuit 21, R11 and R12 are resistors, and divide the input voltage. The resistor R13 and the capacitor C1 are CR filters, which are formed of a semiconductor chip. When obtaining a constant value CR filter, the capacitance C is usually small and the resistance value R is large in order to reduce the area. The voltage of the capacitor C1 is amplified by the operational amplifier OP1. The operational amplifier OP1 is connected to a power source Vcc having a constant voltage and a constant current. The second input voltage detection circuit 23 is similarly configured, and includes a resistor R21, a resistor R22, a resistor R23, a capacitor C2, and an operational amplifier OP2.

In FIG. 3, the control result of the voltage control apparatus when the disconnection failure or the excessive output failure occurs in either one of the input voltage detection circuits has been described. Based on these control results, it is examined whether the selector switch 30 of the control processing unit 25 should be connected to the AND circuit 28 side or the OR circuit 29 side. The problem is (1) when input voltage> reference voltage, and when the circuit 23 side is disconnected, the switch element is turned on on the OR circuit side, and overcharge is performed. (2) When the input voltage is smaller than the reference voltage and the circuit 23 side is excessively output, the switching element is turned off on the AND circuit side and charging is not performed.

In the above description, when all the logic outputs of the comparison circuits 39, 40, and 41 are at a high level, the switching element 12 is turned on and the generator output voltage is restored to the reference voltage. For a logical output, a majority decision is made to determine whether it is high level or low level, that is, in this case, when two or more logic outputs are high level, the switching element 12 is turned on and two or more logic outputs are turned on. When is at a low level, the switching element 12 may be turned off. If the logic outputs of the comparison circuits 39, 40, 41 are determined by majority decision, it is possible to normally control any one of the three monitoring detection circuits of the input voltage.

Claims (5)

A vehicle power generation voltage control device for controlling an output voltage of the vehicle power generator or a battery terminal voltage connected to the vehicle power generator to a target voltage by intermittently exciting current flowing in a field winding of the vehicle power generator. In
The output voltage of the vehicle generator or the battery terminal voltage connected to the vehicle generator is detected by a plurality of monitoring detection circuits, respectively.
The excitation current flowing in the field winding of the vehicle generator is intermittently generated by the outputs of the plurality of monitoring detection circuits, and the output voltage of the vehicle generator or the battery terminal voltage connected to the vehicle generator is changed. A vehicular power generation voltage control device controlled to a target voltage. A vehicle power generation voltage control device for controlling an output voltage of the vehicle power generator or a battery terminal voltage connected to the vehicle power generator to a target voltage by intermittently exciting current flowing in a field winding of the vehicle power generator. In
The output voltage of the vehicular generator or the battery terminal voltage connected to the vehicular generator is input and the detected input voltage is compared with a reference voltage, and an output is generated when the input voltage is smaller than the reference voltage. A plurality of monitoring detection circuits;
A control processing unit that generates an output on condition that an output when an input voltage becomes smaller than a reference voltage is generated from all of the plurality of monitoring detection circuits,
An excitation current is caused to flow in the field winding of the vehicle generator by the output of the control processing unit, and the output voltage of the vehicle generator or the battery terminal voltage connected to the vehicle generator is controlled to a target voltage. The vehicular generated voltage control apparatus. The plurality of monitoring detection circuits include an input voltage detection circuit that detects an input voltage when an output voltage of the vehicle generator or a battery terminal voltage connected to the vehicle generator is input, and the input voltage detection circuit Each has a comparison circuit that compares the detected input voltage with a reference voltage and generates an output when the input voltage is smaller than the reference voltage,
The control processing unit includes an AND circuit that generates an output on condition that an output when an input voltage becomes smaller than a reference voltage is generated from all of the comparison circuits of the plurality of monitoring detection circuits. The vehicular power generation voltage control device according to claim 2. The control processing unit includes an OR circuit that generates an output on condition that an output when the input voltage becomes lower than a reference voltage is generated from any of the comparison circuits of the plurality of the monitoring detection circuits. ,
The output of the OR circuit when a voltage equal to or higher than the target voltage is input to the plurality of monitoring detection circuits as an output voltage of the vehicle generator or a battery terminal voltage connected to the vehicle generator. The vehicular power generation voltage control device according to claim 2 or 3, wherein a disconnection failure of the monitoring detection circuit is detected. A vehicle power generation voltage control device for controlling an output voltage of the vehicle power generator or a battery terminal voltage connected to the vehicle power generator to a target voltage by intermittently exciting current flowing in a field winding of the vehicle power generator. In
The output voltage of the vehicular generator or the battery terminal voltage connected to the vehicular generator is input and the detected input voltage is compared with a reference voltage, and an output is generated when the input voltage is smaller than the reference voltage. Having three or more monitoring detection circuits,
The number of the monitor detection circuits that generate an output when the input voltage becomes smaller than the reference voltage from the plurality of monitor detection circuits, the monitor detection circuit that does not generate an output when the input voltage becomes smaller than the reference voltage A control processing unit that generates output on condition that the number is greater than
An excitation current is caused to flow in the field winding of the vehicle generator by the output of the control processing unit, and the output voltage of the vehicle generator or the battery terminal voltage connected to the vehicle generator is controlled to a target voltage. The vehicular generated voltage control apparatus.

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